[R] Constructing arguments for plotmath

[Wu Gong]

I failed many times until Gabor gave his solution. The magic tick!

PART1 <- 'TEXT'
PART2 <- '^'
PART3 <- '`\u00ae`'
ARG <- paste(PART1, PART2, PART3) 
text(2,8, parse(text=str))

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A R learner.
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